Table 1.

Characteristics of juvenile arthritis (JA) and corresponding control groups.

nSex M, %; F, %Age, yrs mean ± SD
Oligoarticular
  Oligoarticular JIA21334:666.9 ± 4.3
  Olligoarticular control51535:658.5 ± 3.8
Polyarticular
  Polyarticular JIA12024:7610.6 ± 4.7
  Polyarticular control79824:7610.7 ± 4.1
Polyarticular RF–
  Polyarticular RF−9227:739.8 ± 4.8
  Polyarticular RF− control82427:7310.6 ± 4.2
Polyarticular RF+
  Polyarticular RF+ JIA2814:8613.2 ± 3.3
  Polyarticular RF+ control57814:8613.2 ± 3.1
Systemic
  Systemic JIA4060:407.4 ± 4.8
  Systemic control19759:419.9 ± 4.3
  • JIA: juvenile idiopathic arthritis; RF−: rheumatoid factor negative; RF+: rheumatoid factor positive.